JP2820522B2 - Facsimile receiving system using audio line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to an audio / video service provided by a communication satellite or the like.
The present invention relates to a facsimile receiving system using an audio line, which is an audio channel, among video lines (hereinafter, referred to as an AV line).

(Prior Art) Conventionally, in an AV service using a communication satellite, two channels are used as an audio line, and are used as a stereo or monaural broadcast program depending on the contents of the service. During stereo broadcasting, channel 1 (ch1) has left audio (L) and channel 2 (ch
Right audio (R) is sent to 2), and for monaural broadcasting, ch1, c
The same audio signal is transmitted for h2.

FIG. 2 is a block diagram showing an example of a circuit configuration of a communication satellite receiving apparatus used in a conventional communication satellite line.

This communication satellite receiving apparatus has a satellite receiving antenna 1, to which a satellite tuner 2, an AV decoder 3, and an AV monitor 4 such as a receiver are connected.

In this type of apparatus, a satellite radio wave received from a satellite receiving antenna 1 is detected by a satellite receiving tuner 2. The detection output signal S2 is demodulated by the AV decoder 3 into a one-channel video signal (video signal) V and two-channel audio channels ch1 and ch2 and supplied to the AV monitor 4.

Conventionally, in an AV service like the configuration example in FIG. 2,
There was a strong demand to broadcast facsimile information as complementary information for AV programs, but this has not been realized. If facsimile broadcasting is to be realized by the communication satellite receiving apparatus having the configuration example shown in FIG. 2, the following two methods (1) and (2) can be considered.

(1) The audio channel of the AV service is set to a monaural system. For example, ch1 is assigned to audio and ch2 is assigned to facsimile broadcasting for service.

(2) In addition to the audio channels ch1 and ch2, for example, a channel ch3 is added, and the channels ch1 and ch2 are allocated to audio and the channel ch3 is allocated to facsimile broadcasting for service.

(Problems to be Solved by the Invention) However, when a facsimile receiving system is configured by using the above method (1), since the audio channel is set to a monaural system, it becomes impossible to broadcast a stereo program and the quality of AV service is reduced. Is extremely reduced. Further, when the facsimile receiving system is configured by using the method (2), the transmitting side allocates a channel ch3 for facsimile broadcasting to perform the service. Therefore, the communication satellite receiving apparatus on the receiver side newly has an audio channel. Must be added, which places a heavy burden on the recipient. Therefore, even if a facsimile broadcasting service is provided by using the conventional technology, it has been difficult to provide a facsimile receiving system that is technically and economically satisfactory.

An object of the present invention is to provide a facsimile receiving system using an audio line, which solves the problem of the prior art that it is difficult to provide a facsimile broadcasting service using a conventional communication satellite receiving system. is there.

(Means for Solving the Problems) In order to solve the problems, a first invention of the present invention provides an audio line for receiving a signal transmitted via a satellite communication line having a plurality of audio channels. In the facsimile receiving system used, a facsimile apparatus that receives a facsimile signal via a switching unit that switches the plurality of audio channels is connected to a receiving apparatus that receives an audio signal transmitted via the satellite communication line. The switching unit connects any one of the plurality of audio channels connected to the reception device to the facsimile device based on a control signal included in a signal received by the reception device, and Then, the facsimile apparatus receives the facsimile signal.

According to a second aspect, in the facsimile receiving system using the audio line according to the first aspect, the facsimile apparatus is further connected to a telephone line, and the facsimile apparatus is connected to the audio channel via the switching means. A control circuit for disconnecting the facsimile apparatus from the telephone line when the facsimile apparatus is disconnected from the telephone line, and outputting a switching signal to connect the facsimile apparatus to the telephone line when the facsimile apparatus is not connected to the audio line. ing.

(Operation) According to the first and second aspects of the present invention, the facsimile receiving system is configured as described above. Therefore, at the time of facsimile broadcasting, the switching unit switches based on the control signal included in the signal received by the receiving device. Perform the operation. The switching means switches the audio signal received by the receiving device to a facsimile signal and sends the signal to the facsimile device. The facsimile apparatus receives a facsimile signal output from the switching means. As a result, except for the facsimile broadcasting time zone, the stereo broadcasting service is enabled, and the facsimile signal is received by switching the audio signal. Therefore, it is not necessary to construct an additional audio channel on the receiving side.

Further, the facsimile apparatus of the second invention has a function of switching and receiving between a telephone line and an audio channel, so that it is possible to use a normal telephone line facsimile and a facsimile broadcasting receiver in combination. it can.

For example, in the first and second inventions, when the number of audio channels is two, the switching means receives a monaural signal using one of the two light beam audio channels and receives the other audio channel. To receive a facsimile signal, and cause the facsimile apparatus to receive the facsimile signal. In the facsimile apparatus according to the second aspect of the present invention, the facsimile apparatus is connected to the telephone line except for the facsimile broadcasting time zone, so that normal facsimile reception can be used. Therefore, the above problem can be solved.

(Embodiment) FIG. 1 is a configuration block diagram of a facsimile broadcast receiving apparatus in a facsimile receiving system showing an embodiment of the present invention.

This facsimile broadcast receiver uses a satellite receiving antenna.
A receiving device (for example, an AV decoder 13 via a satellite reception tuner 12 for detection) is connected to the antenna 11. The AV decoder 13 inputs the detection output signal S12 of the tuner 12, decodes the detection output signal S12 to enable reception only by a specific subscriber, and outputs the video signal V, the audio channels ch1, ch2, and the control signal. It has a function to decrypt with CS. An AV monitor 14 is connected to the output side of the AV decoder 13, and a facsimile device 30 is connected via a switching means (for example, a switching control device) 20. The AV monitor 14 has a function of displaying a video signal V as an image and outputting a sound.

The switching control device 20 has a function of controlling switching between the audio channels ch1 and ch2, and the left audio L and the right audio R of the audio channel are connected to the AV monitor 14,
The switched facsimile signal F is connected to the facsimile machine 30, and the input control signal CS is further transmitted to the facsimile machine 30.
It has a function to supply to 30. Facsimile machine 30
Has a function of performing switching control between the facsimile signal F from the switching control device 20 and the telephone line 40 based on the control signal CS, and receiving the switched signal.

FIG. 3 is a circuit configuration diagram of the switching control device 20 and the facsimile device 30 in FIG.

The switching control device 20 includes a switching circuit 21 that performs a switching operation according to the switching signal S31a. The switching circuit 21 has a switching signal S3
Switching relay 22 operated by 1a and its switching contacts 22a, 22b
The audio input signals of channels ch1 and ch2 are switched by the switching contacts 22a and 22b, the left audio L and right audio R signals are supplied to the AV monitor 14, and the facsimile signal F is supplied to the facsimile device 30. Circuit.

The facsimile device 30 has a control circuit 31 that receives a control signal CS and outputs switching signals S31a and S31b. One switching signal S31a is connected to a switching relay 22 driven by a DC power supply + VDD, and A switching contact 31a that is turned on and off by the switching signal S31b is connected to the switching signal S31b. The switching contact 31a switches between the facsimile signal F from the switching control device 20 and the facsimile signal from the telephone line 40, and transmits the switched facsimile signal to the modem 32.
It has a function to send to.

The modem 32 is a circuit for demodulating a facsimile signal from the switching contact 31a and modulating a facsimile signal to be transmitted. A facsimile control circuit 33 is connected to the modem 32. The facsimile control circuit 33 performs data compression /
This circuit controls expansion, reading of input documents, printing of facsimile signals, and the like, and includes a central processing unit (hereinafter, referred to as a CPU) and the like. Further, a switching contact 33a that is turned on and off under the control of the facsimile control circuit 33 is connected to the switching contact 31a. The switching contact 33a has a function of switching and connecting the telephone line 40 to the switching contact 31a side and the handset 34 side.

A facsimile receiving operation of the facsimile broadcast receiving apparatus configured as described above will be described.

When the facsimile broadcast is performed, the radio wave of the facsimile broadcast is received by the satellite receiving antenna 11, the antenna output signal is detected by the satellite receiving tuner 12, and the detected output signal S12 is sent to the AV decoder 13. The AV decoder 13 decodes the detection output signal S12, decodes the video signal V, the audio channels ch1 and ch2, and the control signal CS, supplies the video signal V to the AV monitor 14, and outputs the audio channels ch1, ch2 and The control signal CS is supplied to the switching control device 20. The control signal CS is supplied to a control circuit 31 in the facsimile machine 30 via the switching control device 20.

In the control circuit 31, the switching relay 22 is turned on, and the switching contacts 22a and 22b are turned on. Then, the audio signal of channel ch1 is output to the left audio L and right audio R of the AV monitor 14, and the audio signal of channel ch2 is converted to a facsimile signal F by the facsimile apparatus.
Supplied to 30. Here, the internal impedance of the audio output circuit provided in the AV decoder 13 is sufficiently low, and the input impedance of the audio input circuit in the AV monitor 14 is set sufficiently high, so that the switching contacts 22a and 22b are switched. Shock and level fluctuations at times are almost negligible.

The control circuit 31 in the facsimile device 30 checks conditions for receiving a facsimile broadcast (for example, address information and a unique number of the receiving device). If the condition is met, the control circuit 31 switches the switching contact by the switching signal S31b.
31a is switched to the make state. Then, the switching control device 20
Is supplied to the modem 32, and the preparation for facsimile broadcast reception is completed. After that, if a facsimile signal is connected to channel ch2 on the transmission side, the image signal is received by the modem 32 via the switching contact 31a following the control procedure signal for facsimile reception, and the facsimile control circuit 33 receives the facsimile broadcast signal. The operation is performed, and printing of the received image signal is performed.

On the other hand, when the switching relay 22 in the switching control device 20 is turned on and the reception condition is checked by the control circuit 31 in the facsimile device 30, if the reception condition is not met, the switching contact 31a Is inactive (third
(The state shown in the figure), and the facsimile broadcast receiving operation is not executed.

In a state where the control signal CS other than the time of the facsimile broadcast is not received, the switching contact 31 in the facsimile apparatus 30 is provided.
Since “a” is connected to the telephone line 40, the facsimile device 30 operates as a normal facsimile device, and facsimile transmission or reception is executed via the telephone line 40. During this facsimile operation period, the handset
The switching contact 30a between the facsimile machine 30 and the facsimile machine 30 maintains the make state, and connects the telephone line 40 to the modem 32 side.

As described above, in this embodiment, by combining the switching control device 20 and the facsimile device 30, at the time of facsimile broadcasting, the channel ch1 is output as an audio channel to the AV monitor 14 as a monaural signal, and the channel ch2 is used as the facsimile signal F. Output to facsimile machine 30. As a result, a stereo broadcast service can be provided except for a facsimile broadcast time zone. Moreover,
A facsimile broadcast for transmitting a facsimile signal to a plurality of destination terminals via an existing AV line can be realized at low cost without requiring additional audio channel construction work on the receiving side. The facsimile device 30 is connected to the telephone line 40 except during facsimile broadcasting, and normal facsimile communication using the telephone line 40 can also be used.

Note that the present invention is not limited to the above embodiment, and various modifications are possible. For example, there are the following modifications.

(I) In FIG. 3, the switching circuit 21 is configured by the switching relay 22 and the switching contacts 22a and 22b, but these may be configured by using a transistor circuit or the like. Further, the control circuit 31 for performing switching control of the switching circuit 21 is provided in the facsimile machine 30.
It may be provided on the side.

(Ii) In the facsimile apparatus shown in FIG.
Although a is used to switch between the facsimile signal from the switching control device 20 and the facsimile signal from the telephone line 40, the switching contact 31a may be configured using another circuit such as a transistor. Also, this switching contact 31a
The control circuit 31 for switching control of the facsimile control circuit 33
It may be provided inside. Thereby, the circuit configuration can be simplified.

(Iii) In the facsimile broadcast receiving apparatus of FIG.
For example, another circuit block may be provided on the satellite receiving tuner 12 side to improve the receiving sensitivity.

(Effects of the Invention) As described in detail above, according to the first and second aspects, the switching means and the facsimile apparatus are provided on the output side of the receiving apparatus, and the control included in the signal received by the receiving apparatus is provided. Based on the signal, the audio channel is switched by the switching means so that the facsimile signal is received by the facsimile device. Facsimile broadcasting can be realized economically. In particular, in a circuit configuration in which satellite communication is operated in a broadcast form, facsimile broadcast communication can be executed without changing an existing audio line, so that a great economic effect can be expected. Moreover, since the audio signal and the facsimile signal are not switched except during the facsimile broadcast, the conventional stereo broadcast service can be provided.

Furthermore, in the second aspect, the facsimile apparatus is connected to the telephone line except during facsimile broadcasting, so that normal facsimile communication using the telephone line can be used.

For example, in the first and second inventions, when a plurality of audio channels are set to two lines, the two lines are switched by a switching unit based on a control signal sent from a transmitting side, and one of the audio channels is used for facsimile broadcasting. By providing a monaural signal to an AV device by a channel and a facsimile signal to the facsimile device by the other audio channel, a facsimile broadcasting service can be realized at a low cost with a simple circuit configuration using an existing AV line.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a facsimile broadcast receiving apparatus in a facsimile receiving system according to an embodiment of the present invention, FIG. 2 is a block diagram showing a circuit configuration example of a conventional communication satellite receiving apparatus, and FIG. FIG. 2 is a circuit configuration diagram of a switching control device and a facsimile device in the middle. 11 ... satellite receiving antenna, 12 ... satellite receiving tuner,
13 AV decoder, 14 AV monitor, 20 Switching control device, 21 Switching circuit, 30 Facsimile device, 31
Control circuit, 31a switching contact, 32 modem, 33 facsimile control circuit, 40 telephone line, ch1, ch2 audio channel, CS control signal, F facsimile signal, S31a, S31b ...... Switching signal, V ... Video signal.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-239767 (JP, A) JP-A-1-305683 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04N 1/00

Claims (2)

(57) [Claims] 1. A facsimile receiving system using an audio line for receiving a signal transmitted via a satellite communication line having a plurality of audio channels, comprising: a receiving unit for receiving an audio signal transmitted via the satellite communication line; The apparatus is connected to a facsimile apparatus that receives a facsimile signal through a switching unit that switches the plurality of audio channels, and the switching unit performs the switching based on a control signal included in the signal received by the receiving device. A facsimile receiving system using an audio line, wherein any one of a plurality of audio channels connected to a receiving device is connected to the facsimile device, and the facsimile device receives the facsimile signal on the audio channel. . 2. The facsimile receiving system according to claim 1, wherein said facsimile apparatus is further connected to a telephone line, and said facsimile apparatus is connected to said audio channel via said switching means. A control circuit for disconnecting the facsimile apparatus from the telephone line when the facsimile apparatus is not connected to the audio channel, and outputting a switching signal to connect the facsimile apparatus to the telephone line when the facsimile apparatus is not connected to the audio line. A facsimile receiving system using an audio line.